examples.js

// Crear una clase builder para un request http
// (Puede incluir URL, headers, body, timeout, etc…)
'use strict';

class httpBuilder {
    url = function(url) {
        this.url = url;
        return this;
    }
    headers = function(headers) {
        this.headers = headers;
        return this;
    }
    timeout = function(timeout) {
        this.timeout = timeout;
        return this;
    }
    body = function(body) {
        this.body = body;
        return this;
    }

    build = function() {
        return new httpClient(this.url, this.headers, this.timeout, this.body);
    }
}

class httpClient {
    constructor(url, headers, timeout, body) {
        this.url = url;
        this.headers = headers;
        this.timeout = timeout;
        this.body = body;
    }

    post = function() {
        return `hola, soy un post y este es mi bearer ${this.headers.Authorization} y mi body es ${this.body}`;
    };

    get = function() {
        return `hola, soy un get y este es mi timeout ${this.timeout}`;
    };
};

const client = new httpBuilder()
                .url('localhost:3000')
                .headers({Authorization: 'Bearer asd'})
                .body({test: 'moons'})
                .timeout(3000)
                .build();

console.log(client.post());
console.log(client.get());

// Crear un singleton para configuración

class SingleConfig {
    static instance;
    constructor(config1, config2) {
        if(SingleConfig.instance) return this.constructor.instance;
        
        this.config1 = config1;
        this.config2 = config2;

        SingleConfig.instance = this;
        return this.instance;
    }
}

const config = new SingleConfig('configuración 1', 'configuración 2');
console.log(config)

const config2 = new SingleConfig('configuración 3', 'configuración 4');
console.log(config2)

const config = new SingleConfig('configuración 1', 'configuración 2');
console.log(config)

const config2 = new SingleConfig('configuración 3', 'configuración 4');
console.log(config2)